N1973, congress passed the war powers act, which required the president to seek congressional approval for the commitment of american troops overseas.

The War Powers Act allows the president to send troops to a country or territory for 60 days without Congressional approval. However, the president must give Congress a 48 hour notification of this movement. If the president does not get Congressional approval during this 60 day window, then they have a 30 day window to withdraw the troops. This law helps to limit the power of the executive branch.